Shock absorber for fluid systems

Claim 1

A HYDRAULIC SHOCK ABSORBER FOR A SYSTEM FOR HANDLING FLUIDS, SAID SHOCKS ABSORBER COMPRISING A PISTON AND CYLINDER, ONE OF WHICH IS ADAPTED TO BE CONNECTED TO SAID SYSTEM AND THE OTHER OF WHICH IS ADAPTED TO BE CONNECTED TO A STRUCTURE, A FLUID CONDUIT SYSTEM PROVIDING COMMUNICATION BETWEEN THE TWO SIDES OF SAID PISTON, MEANS FOR NORMALLY RESTRICTING A RATE OF FLUID FLOW THROUGH SAID CONDUIT SYSTEM, MEANS RESPONSIVE TO SHOCK IN EXCESS OF A PREDETERMINED MAGNITUDE TO FURTHER RESTRICT SAID RATE OF FLOW, SAID LAST-MENTIONED MEANS COMPRISING MOVABLE VALVE MEANS RESPONSIVE TO SHOCK IN EXCESS OF SAID PREDETERMINED MAGNITUDE TO AUTOMATICALLY EFFECT SAID FURTHER RESTRICTION OF SAID RATE OF FLOW, A FLUID RESERVOIR, SAID VALVE MEANS COMPRISING A VALVE PISTON SLIDABLY RECEIVED IN A PASSAGE AND DIVIDING SAID PASSAGE INTO A FIRST CHAMBERLOCATED IN SAID CONDUIT SYSTEM AND HAVING A FIRST PORT CONNECTED WITH ONE SIDE OF SAID PISTON THROUGH A RESTRICTION, A SECOND PORT CONNECTED WITH THE OTHER SIDE OF SAID PISTON THROUGH A SECOND RESTRICTION AND A THIRD PORT CONNECTED WITH SAID RESERVOIR, AND A PAIR OF CONTROL CHAMBERS ONE OF WHICH IS CONNECTED TO ONE SIDE OF SAID PISTON AND THE OTHER OF WHICH IS CONNECTED TO THE OTHER SIDE OF SAID PISTON, SAID VALVE PISTON BEING MOVABLE IN RESPONSE TO SHOCK IN EXCESS OF SAID PREDETERMINED MAGNITUDE TO COOPERATE WITH SAID FIRST AND SECOND PORTS OF EFFECT SAID FURTHER RESTRICTION OF SAID RATE OF FLOW WHILE LEAVING SAID THIRD PORT OPEN.